Android: If you need a little motivation to make it to the gym, you could always think about your health—or, with Fitsby, you can think about the money your friends will wave in your face if you skip out on your workouts. The app lets you wager with friends that you'll work out regularly, and when you do, you earn points—not to mention the money your friends who didn't go put into the pot.

If the app sounds a bit like previously mentioned Gympact, which just launched for Android last week, it should. The principle is the same. Some of you were concerned about putting your money where your workouts were when it came to strangers who might exploit the system, and Fitsby eliminates that problem by connecting you with your friends and letting you all pool your money together for a group challenge.

Android: Last year, Gympact for iPhone encouraged you to go to the gym by paying you real money for …
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You can, of course, challenge other users of the app or participate in public challenges if you want, but the app is best when used with a small group of dedicated friends who want to support one another's workout and exercise goals. You still have to check into an approved gym or exercise center for the app to work (the service uses a location's name in Google Places to verify that it's actually a gym, fitness center, or other appropriate location), and if you win, your friends' money will be sent to you via Paypal. For more details on how the app works, check out their FAQ. Fitsby is free, and currently only available for Android. The developers say an iOS version is on the way soon.